#include <stdio.h>
int main()
{
  char grade;
  scanf("%d", &grade);
  printf("Your score:");
  switch (grade)
  {
  case 'A':
    printf("85��100\n");
    break;
  case 'B':
    printf("70��84\n");
    break;
  case 'C':
    printf("60��69\n");
    break;
  case 'D':
    printf("<60\n");
    
  default:
    printf("data error!\n");
  }
  return 0;
}
